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ad9910: Add inverse FTW/ASF conversions

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David Nadlinger 2019-01-08 02:16:42 +00:00
parent 4d793d7149
commit 7bcdeb825b
1 changed files with 19 additions and 5 deletions
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24
artiq/coredevice/ad9910.py
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@ -468,23 +468,37 @@ class AD9910:
"""
return int32(round(self.ftw_per_hz*frequency))
@portable(flags={"fast-math"})
def ftw_to_frequency(self, ftw):
"""Return the frequency corresponding to the given frequency tuning
word.
"""
return ftw / self.ftw_per_hz
@portable(flags={"fast-math"})
def turns_to_pow(self, turns):
"""Return the phase offset word corresponding to the given phase
in turns."""
return int32(round(turns*0x10000))
@portable(flags={"fast-math"})
def amplitude_to_asf(self, amplitude):
"""Return amplitude scale factor corresponding to given amplitude."""
return int32(round(amplitude*0x3ffe))
@portable(flags={"fast-math"})
def pow_to_turns(self, pow_):
"""Return the phase in turns corresponding to a given phase offset
word."""
return pow_/0x10000
@portable(flags={"fast-math"})
def amplitude_to_asf(self, amplitude):
"""Return amplitude scale factor corresponding to given fractional
amplitude."""
return int32(round(amplitude*0x3ffe))
@portable(flags={"fast-math"})
def asf_to_amplitude(self, asf):
"""Return amplitude as a fraction of full scale corresponding to given
amplitude scale factor."""
return asf / float(0x3ffe)
@kernel
def set_frequency(self, frequency):
return self.set_ftw(self.frequency_to_ftw(frequency))